The server expected on localhost:2737 is then Apertium-apy . (See http://wiki.apertium.org/wiki/Apy for instructions; you'll have to install Apertium and at least one language pair too). Adjust configuration according to your requirement and restart the server.

On recent versions of Debian, Fedora and other operating systems using systemd, use a cxserver.service unit file similar to the following template (modify the file paths as appropriate) and place file at /lib/systemd/system/ directory.